Wood pulley.



No. 669,668. Patented Mar. I2, I90I. u. A. SPRINKLE.

W000 PULLEY.

"Application filed Nov. 17, 1900.)

(No Model.)

DAVID A. SIRINKLE, OF PENNSBORO, WEST VIRGINIA.

WOOD PU LLEY.

$PEGIFIGATION forming part of Letters Patent No. 669,668, dated March 12, 1901.

' Application filed November 17, 1900. Serial No. 36,842. (No model.)

- iug drawings, and to the letters of reference marked thereon, which form a part of this specification.

My invention relates to an improvementin wood pulleys in which the rim and arms are constructed separately and afterward joined together, and is particularly applicable to pulleys constructed with bent-wood rims; and the object of my improvement is to provide constructive means for joining and binding together the driving-arms and the rim of such pulleys in a more secure manner than has been done heretofore. I attain this object by the mechanism illustrated inthe accompanying drawings, in Which- Figure 1 is a perspective view of a separable wood pulley embodying my improvement; Fig. 2, a sectional view on line 00 cc of Fig. 1, and Fig. 3 a section in part of the rim and arm at right angles to the pulley-axis.

Similar letters refer to similar parts throughout the several views.

The pulley-rim I prefer to build up of three separate bent-wood bands a a 0. which are glued together in the process of manufacture. This construction of'the pulley-rim counteracts to a large extent the warping and twisting that would occur in a bent rim made of one piece. The external band a, is made of hard Wood susceptible of taking a smooth finish, which is best adapted for belt-driving. The internal band a is also made of hard Wood; but the central band a is of soft wood, such .as white pine, for the following reasons: first, that a better glue-joint can be made between'such surfaces than if both were hard Wood; second, that the soft-Wood hand a being disposed between bands at and c of hard wood, will act. as a cushion for jars or blows that the pulley-face may be subjected to.

The hub of the pulley is formed by the arms B and the hub-blocks b, secured together by the use of glue or cement and by the dowelpins b of wood. The arm-lugs D are secured to the arms B in the same manner as the hub-blocks. The arm-lugs D at one end of the pulley-arms B of each pulley-section project slightly from between the arms, so as to interlock with the opposite section for the purpose of maintaining the alinement of the parts.

The anchor-bolts (1 pass through the armlugs D and pulley-rim a a a and are provided with cone-shaped anchor-nuts 01', made of soft lead, Babbitt metal, or a metal of like character for the purpose. The anchor-bolts are provided with roughened threads or with roughened circular grooves or with indentations for the purpose of securely engaging the soft-metal nuts d cast upon them. This is accomplished by inserting the'bolts in place and then pouring molten metal aboutthe ends in the coneshaped openings made in the pulley-rim for the purpose. The molten metal fills up the small cavities presented by the grain of the Wood and forms a lock to prevent the nut from turning loose. These soft nuts may, if necessary, be tightened in their seats by hammering after the metal has cooled and are turned off smooth with the face of the pulley when the latter is turned in a lathe.

Before applying the anchor-bolts to the pulley the rim and arms of the same are joined together by the use of glue.

The bolts 1) are for the purpose of clamping the pulley on its shaft.

I am aware that it is common practice to construct pulleys of wood throughout, that such pulleys have bent rims constructed of one piece or thickness or of anumber of layers put together in the mannerI have described or have rims built up of a nuin'm. f.

The combination, in awood pulley, with the about the ends of the bolts, substantially as 10 rim and arms thereof, of lugs secured to the shown and described. arms and adapted to fit the inside of the pul- In testimony whereof I affix my signature ley-rim and to receive bolts for binding them in presence of two Witnesses. 5 to the rim; anchor-bolts passing through the arm-lugs and rim of pulley and cone-shaped DAVID SPRINKLE' nuts of soft metal which have their bearing Witnesses:

Within the pulley-rim and are flush with the JNO. F. SHORE, face thereof, said nuts being cast in place 7 O. S. SAMS. 

